Well yeah, you gotta grow the business, as any good visitor of this site knows. You can only sell so many $30 buckets of loosely assorted pieces intended for children.
There's much more money to be made in $200 sets with the popular IP of the day or $500 collector sets for adults.
>Well. You have to exist, which means you compete, which might mean you grow.
Why growth? At some point you would eventually hit perfect saturation anyway, the steady state where everyone already is buying your product to the extent anyone can buy it. I get that losing business is bad, and it's better to "overcorrect" to growth, but as long as you compete enough to keep approximately same market share against other competitors, selling inflation adjusted $30 buckets of bricks to each generation of kids with profit sounds like perfectly good business. Owner of the business would receive steady income selling the inflation adjusted $30 buckets.
I'd imagine you'd hit problems when the buckets of bricks you are selling are ~eternal and number of kids is no longer growing, so nobody needs new ones.
There's much more money to be made in $200 sets with the popular IP of the day or $500 collector sets for adults.